JSON for Modern C++ 3.8.0

accept
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basic_json
basic_json
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~basic_json
| ## ◆ flatten()
basic_json nlohmann::basic_json::flatten | ( |  | ) | const
| inline
  The function creates a JSON object whose keys are JSON pointers (see RFC 6901) and whose values are all primitive. The original JSON value can be restored using the unflatten() function. Returns an object that maps JSON pointers to primitive values Note Empty objects and arrays are flattened to `null` and will not be reconstructed correctly by the unflatten() function. Complexity Linear in the size the JSON value. Example The following code shows how a JSON object is flattened to an object whose keys consist of JSON pointers. 1 #include <iostream> 2 #include <iomanip> 3 #include <nlohmann/json.hpp> 4 5 using json = nlohmann::json; 6 7 int main() 8 { 9 // create JSON value 10 json j = 11 { 12 {"pi", 3.141}, 13 {"happy", true}, 14 {"name", "Niels"}, 15 {"nothing", nullptr}, 16 { 17 "answer", { 18 {"everything", 42} 19 } 20 }, 21 {"list", {1, 0, 2}}, 22 { 23 "object", { 24 {"currency", "USD"}, 25 {"value", 42.99} 26 } 27 } 28 }; 29 30 // call flatten() 31 std::cout << std::setw(4) << j.flatten() << '\n'; 32 } Output (play with this example online):
      {
          "/answer/everything": 42,
          "/happy": true,
          "/list/0": 1,
          "/list/1": 0,
          "/list/2": 2,
          "/name": "Niels",
          "/nothing": null,
          "/object/currency": "USD",
          "/object/value": 42.99,
          "/pi": 3.141
      }
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/flatten.cpp -o flatten
See also unflatten() for the reverse function Since version 2.0.0 Definition at line 23797 of file json.hpp.

nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2774